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Posted: 10/25/2011 8:00:04 PM EDT
| Outside of caliber and BHO, what's the main difference. I'd like to get a regular mp5, but I've seen mp5/40's for almost half the price. Why is that and should I consider the /40 instead? |
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The .40s you have seen are "vector kits" they are parts that Vector rejected from Special Weapons because of CC issues. If it is build by a good builder they will typically run with a new bolt head. RCMs .40 bolt head works great (Before the only option was H&K and that was $$) A lot of the internal parts are different (Trunion, bolt group, magazines, etc) Your taking a gamble buying one. |
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I personally think 9mm is the only way to go for an Mp5, more parts can be found easier, shoots the cheaper 9mm ammo, it was originally made for 9mm, you can use a three lug suppressor, 100rd Beta-C drum.
There are some differences besides just the caliber. The Mp5/40 uses clear plastic magazines, has a last round bolt hold open, the retractable stock has a cut in the left side to stay out of the way of the last round bolt hold open. The Mp5-40 is cool in some ways because it is different than the usual Mp5, has some more modern upgrades like the clear plastic mags and last round bolt hold open. Of course I'm not a big fan of the .40 caliber in general, so i went with 9mm for my Mp5. |
| I have them both. If you want a cheap fun gun, go with the 9mm. If you want to feel a little more power when you shoot, go with the 40. The 40 will cost you a little more to feed and if a part breaks and you have to replace it with a HK part. With the sear, I like the feel of the 40 more, but I shoot the 9mm more often. If yuo get a good gun you will be happy with either one. |
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All the receivers (and parts) came from T.Bailey at Specials Weapons so the fit & finish quality is a direct result of the builders skill. The use of crappy SW internals like the BCG generally make life more difficult.
I'm not a Vector fanboy but have a buddy that owns one of their 9mm MP5 guns and it runs great, never played with a 40 from Vector tho. |
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my /40 is picky about ammo...example is weak reloads require silencer to cycle, otherwise FTE (short strokes essentially) thus I'd go 9mm for no-worry shooting Change your locking piece I'm running the LO24...purchased the HI25 but need to sell it since I sold the 10mm barrel, yet to find ammo that required the steeper angle Pretty sure it's just the ammo; had 1 squib in the 1000rds so far, stopped shooting from that box for a year or so & just pulled it back out to find it cannot funtion. |
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Quoted: Quoted: Quoted: my /40 is picky about ammo...example is weak reloads require silencer to cycle, otherwise FTE (short strokes essentially) thus I'd go 9mm for no-worry shooting Change your locking piece I'm running the LO24...purchased the HI25 but need to sell it since I sold the 10mm barrel, yet to find ammo that required the steeper angle Pretty sure it's just the ammo; had 1 squib in the 1000rds so far, stopped shooting from that box for a year or so & just pulled it back out to find it cannot funtion. What ammo are you using. On a few boxes i've shot through mine i needed the #26 LP |
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It's some junk reloads purchased from Outdoormarksman (appears they are not longer in the business); OMC branded.
I forget the weight, 165gr I think. The 26 is only 10-degree less slope than the LO24 with that OMC ammo I had to use the silencer for more "boost" since a 100-degree LP isn't made (going by HK's recommended <1100fps use of LO24) I'm sure if I reloaded I could get a nice heavy & fast round that would use the HI25. hottest I've tried was some doubletap 135gr rated @ 1400fps (didn't chrono it myself) |
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It's some junk reloads purchased from Outdoormarksman (appears they are not longer in the business); OMC branded. I forget the weight, 165gr I think. The 26 is only 10-degree less slope than the LO24 with that OMC ammo I had to use the silencer for more "boost" since a 100-degree LP isn't made (going by HK's recommended <1100fps use of LO24) I'm sure if I reloaded I could get a nice heavy & fast round that would use the HI25. hottest I've tried was some doubletap 135gr rated @ 1400fps (didn't chrono it myself) I have a ton of TMJ from outdoor marksman when it was 100 for 500. On my Vector v5 sbr/mp5-40, it ran find, I since replaced the front end(barrel etch) w/ german parts along w/ the correct op rod spring, and it no longer ran as well, dribbling out tmj, and occasionally jamming (failure to eject) on some AE commercial 165grain. (hk bolt head, hk ejector, RCM carrier, just got a hk 24 locking piece but running an hk 26 now. Got a spare clone op rod as the weaker spring seemed to let me fire weak .40 loads on the past, hopefully it will help, as w/ what I have invested in it, I want it running good. I will update when hoover tactical opens its new range, I have alot of testing to do to get it to run 100% since the replacement of the front end (barrel, trunnion, replacement of op rod, carrier, and true hk locking piece. ETA- my mp5k has not jammed once, only about 200 rounds through it but its on point w/ its bad self. -Shameless plug/pic- 
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Mp5< Mp5/40 < MP5/10
My SW mp5 ran 100% out of the box. My SW Mp5/40 I changed to an Rcm bolt, hk extractor, spring and ejector, now it runs 100% My vector 40 kit was used to built the 10mm. I had turner fab build it using a new HK barrel, trunion and RCM bolt, . It runs 100% All use HK mags or the 9 runs fine on Korean mags as well as HK. Gsg5 is cheap to run, not near as fun as the 10mm. My only regret is living in a non NFA state  fake cans all around and not the fun kind 
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That 10 degrees can make a huge difference. Roller locks are picky about timing and the .40/10mm are the pickiest. I was shooting Federal 180 ball and 3/4 ran on the #24 and one of boxes wouldn't shoot on anything but #26 I've seen the same with mine. #24 does ok with Federal 180 for the most part. 155 or 165gr won't work, though and need the #25 or 26 LP. |
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Mp5< Mp5/40 < MP5/10 My SW mp5 ran 100% out of the box. My SW Mp5/40 I changed to an Rcm bolt, hk extractor, spring and ejector, now it runs 100% My vector 40 kit was used to built the 10mm. I had turner fab build it using a new HK barrel, trunion and RCM bolt, . It runs 100% All use HK mags or the 9 runs fine on Korean mags as well as HK. Gsg5 is cheap to run, not near as fun as the 10mm. My only regret is living in a non NFA state fake cans all around and not the fun kind Few questions on your 10mm. - Do you run 25 LP on it all the time? How is the impulse on the system, does you feel like it runs hard, i.e beats up on the gun? |
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